5th grader Koh Kitamura lives next door to the Tsukishima family, owners of a batting cage and the Clover cafe. His girlfriend, Wakaba, is the 2nd Tsukishima daughter; the 3rd daughter, the baseball prodigy Aoba, can't stand him. Wakaba dreams of Koh pitching at legendary Koshien Stadium, site of the national high school championship finals. However, tragedy strikes, and it is up to Koh, with the help of Aoba and his other teammates, to make Wakaba's dream come true.